Lunar Strain - Let's be honest, this is not a great album, but has some cool songs, plus that folkish vibe and instrumentals.
Subterranean is much better IMO. Better riffs, better hooks, better singing and most importantly, better melodies. The first real sign of things to come. Stand Ablaze is one of my favorite IF songs.
The Jester Race - Classic stuff. Even when it has flaws, you can easily forgive them for the sheer originality of the record. It has everything: brilliant songwriting, energetic riffing, folk acoustic influences, Maiden-like melodies with more aggression. Production is not good by today standards, but the overall sound and interesting color of solo guitar takes this album to another level. Can't pick any favorites, as there are to many, but I will say that Artifacts of the Black Rain is fun (and easy) song to play.
Whoracle - Good album, with some great songs, but I like it less then TJR because of worse production and some fillers. Still, a step forward with more focused songwriting. Episode 666 is basicly a first Colony song. Many classics here, but I would single out Jester Script Transfigured. So much atmosphere. I just love it. Oh, and "dat growlz man". Anders sounds really convincing and desperate.
Colony - Perhaps my favorite IF album. Great collection of impressive but catchy riffing, beautiful melodies, nice solos, better drumming then on first 3 albums, feral vocals, all combined with good production. It is THE album of the whole melodeath genre. Many good and great songs, but I just love Zombie Inc (and that clean guitar/melodic break) and Man Made God (that song has more good melodic guitar parts then most bands write in their whole career).
Clayman - In many ways ("you're the halo"
) this album is "Colony part II". Cleaner production, more mainstream, more electronic and modern elements, but still, the same formula. Kind of suffers because of few filler songs. Good overall atmosphere and some great songs. Also, the best solos in IF career (ex. Another day in the Quicksand, OFTW, Suburban Me, Bullet Ride, Sat and Astro). My favorite songs: Bullet Ride (hands down one of the best melodeath pieces ever) and Suburban Me (Traditional metal goes wild). Songs I dislike: AtFRIT, Clayman (everybody else seem to like this one), Swim (too happy).
Reroute to Remain - Not a bad album, and a much needed change after two similar records, but confusing production, too many songs and too many fillers, don't do it any good. Still melodic, but riffs and melodies lack charm of the old days. Songs are more mainstream, but not that popish. Some shitty songs, many good (but somehow average sounding). My favorites - Dawn of a New Day, Dismiss the Cynic and Metaphor.
Sountrack to Your Escape - First IF album I've heard. My favorite IF t-shirt. But damn, I hate that shit. Just about everything about this record annoys me. Shitty production, shitty drums, shitty electronics (repeats over and over again from song to song), shitty nu metal, shitty clean vocals. It is more aggressive than RtR but that is not what I'm after. Many fillers, many downright appalling songs (Like you better dead, Bottled...) . Still, some good solos, and I do like My Sweet Shadow (great modern song), Dead Alone and Evil in a Closet. Discover Me like Emptiness is also interesting (nice effects and atmosphere).
Come Clarity - (probably) The second IF album I've heard. And I like it. While not as good as pre-2000 stuff, and a bit too metalcore-ish for my taste it's a cool little record. Powerful production, energetic performance, good screams, good cleans by IF standards (Leeches chorus), good female vocals, groovy songs, aggressive but melodic riffing, few good melodies and solos. I guess my favorites are Dead End, Reflect the Storm, Crawl through Knives, and Come Clarity (oh, that solo, I love to play it). On the other hand, there are many fillers and some pointless (Bedtime) or catastrophic (Scream) songs.
A Sense of (no) Purpose - I kind of liked it (or tolerated it) while it was fresh, but it is just too... boring, washed out and pretty much cringeworty. As I've said many times, that album contains nice collection of good riffs and melodies fucked up by poor songwriting, bad production (and God, that awful guitar sound...), poor electronics and just tragic vocal performance by our dearest Anders. Well, at least the lyrics on this album were an infinite source of fun for years to come (Oh I feel like shiiiiit...). Can't really choose my favorites. Pretty much all songs sound like fillers or really bad fillers. One big filler album, with TCP being the biggest filler of them all. Bonus song were pretty decent though.
Sounds of a Playground Fading - Now, this one is a definite step forward. Solid production (but I don't like the weak guitar sound), great drumming, decent singing, fresh sounding, some interesting songwriting, good electronics. Many interesting moments that would sound out of place alone, but in the context of the whole album, they just fit (The Attic, Jester's door, Liberation). Many good songs (really strong collection). My favorite - A New Dawn. I didn't like some cleans Anders did, I didn't like the borderline popishness, I didn't like some wah-wah generic solos, I didn't like the repetitive generic riffs in some songs and...
LUCKY ME - seems like this are just the elements N'flamerz have chosen as the basis of their next album (SC).